I saw Rolling Stone posted this video the other day.  I had never seen it before & wanted to share it with you.  Petty brings out Eddie Vedder to sing a verse of American Girl.  Although he ends up flubbing a line, he still gave me goosebumps.

Maybe it's because I'm a huge fan of that voice, but I'm pretty sure I'd buy any album of Eddie singing anything: Petty Songs, Boy Band Hits, Nursery Rhymes...anything.